Vacuum



FIG. 1 is an upper perspective view of a vacuum showing the new design;

FIG. 2 is a lower perspective view of the vacuum;

FIG. 3 is a front view of the vacuum;

FIG. 4 is a back view of the vacuum;

FIG. 5 is a right-side view of the vacuum;

FIG. 6 is a left-side view of the vacuum;

FIG. 7 is a top view of the vacuum; and,

FIG. 8 is a bottom view of the vacuum.

The broken lines show portions of the vacuum that form no part of the claimed design. 

CLAIM The ornamental design for a vacuum, as shown and described. 